Site Characterization
Table of Contents
I. INTRODUCTION ................................................................................................ 3
The Offshore Rocks.................................................................................... 3
Description of Habitat................................................................................ 3
General Management Considerations........................................................ 4
Fishing........................................................................................................ 4
Recreational Kayaking and Scuba Diving.................................................... 5
Seaweed collecting..................................................................................... 5
Management recommendations to reduce direct human disturbances....... 5
Invasive Species......................................................................................... 6
Plants.......................................................................................................... 6
Canada Geese............................................................................................. 6
Mammals...................................................................................................... 6
Interaction with other native species........................................................... 6
Management recommendations to reduceimpacts from invasive species..... 6
Oil spills........................................................................................................ 7
Data Gaps..................................................................................................... 7
II. SEABIRD SPECIES ACCOUNTS ............................................................................ 8
Leach’s Storm-Petrel..................................................................................... 8
Ashy Storm-Petrel........................................................................................ 10
Black Storm-Petrel........................................................................................ 12
Fork-tailed Storm-Petrel............................................................................... 14
Brown Pelican............................................................................................... 17
Double-crested Cormorant........................................................................... 20
Pelagic Cormorant........................................................................................ 22
Brandt’s Cormorant...................................................................................... 25
Snowy Egret................................................................................................. 28
Black-crowned Night-Heron.......................................................................... 29
Peregrine Falcon........................................................................................... 30
Black Oystercatcher...................................................................................... 32
Western Gull................................................................................................. 35
Common Murre.............................................................................................. 38
Pigeon Guillemot............................................................................................ 42
Xantus’s Murrelet........................................................................................... 45
Cassin’s Auklet............................................................................................... 48
Rhinoceros Auklet........................................................................................... 51
Tufted Puffin................................................................................................... 55
Literature Cited – Seabirds............................................................................ 58
III. MARINE MAMMAL SPECIES ACCOUNTS ................................................................ 64
Northern Fur Seal........................................................................................... 64
Steller Sea Lion.............................................................................................. 66
California Sea Lion......................................................................................... 69
Harbor Seal.................................................................................................... 71
Northern Elephant Seal.................................................................................. 73
Sea Otter........................................................................................................ 75
Literature Cited – Marine Mammals................................................................ 78
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